题目内容
7.Scientists ______ thousands of chemicals before they decided on the right one in the end.( )A. | tried out | B. | wore out | C. | worked out | D. | turned out |
分析 科学家在最终确定合适的一种之前试验了千万种的化学物质.
解答 答案:A
解析:A:尝试;试验;B:用坏;穿破;耗尽;C:解决;D:结果是.根据句意"科学家在最终确定合适的一种之前试验了千万种的化学物质"及所给选项分析可知本题答案为A选项"试验",其余选项均不符合题意.
点评 本题考查动词短语,做此类题目时要清楚各个选项的含义再根据句意确定最终答案.
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